激光等离子体X射线特征谱轮廓诊断

王瑞荣; 王伟

doi:10.3788/OPE.20142207.1737

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激光等离子体X射线特征谱轮廓诊断

现代应用光学 | 更新时间：2020-08-13

- 激光等离子体X射线特征谱轮廓诊断
- X-ray line profile measurements in laser produced plasma
- 光学精密工程 2014年22卷第7期页码：1737-1742
- 作者机构：
  
  上海激光等离子体研究所上海,201800
- 作者简介：
  
  [ "王瑞荣（1964-），男，江西吉安人，博士，副研究员，1999年于核工业西南物理研究院获得硕士学位，2009年于重庆大学获得博士学位，主要从事高能X射线诊断及诊断技术方面的研究。E-mail：wangrr59@citiz.net" ]
  [ "王伟（1975-），男，河南开封人，博士，研究员，1995年于复旦大学获得学士学位，2001年于中国工程物理研究院获得硕士学位，2006年于复旦大学获得博士学位，主要从事激光等离子体物理的研究。E-mail：wei_wang@fudan.edu.cn" ]
- 基金信息：
  
  国家自然科学基金资助项目（No.11175167）()
- DOI：10.3788/OPE.20142207.1737
  中图分类号： TL653;O433.3
- 收稿日期：2013-11-11，
  
  修回日期：2013-12-10，
  
  纸质出版日期：2014-07-25
- 稿件说明：
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王瑞荣, 王伟,. 激光等离子体X射线特征谱轮廓诊断[J]. 光学精密工程, 2014,22(7): 1737-1742

WANG Rui-rong, WANG Wei,. X-ray line profile measurements in laser produced plasma[J]. Editorial Office of Optics and Precision Engineering, 2014,22(7): 1737-1742
王瑞荣, 王伟,. 激光等离子体X射线特征谱轮廓诊断[J]. 光学精密工程, 2014,22(7): 1737-1742 DOI： 10.3788/OPE.20142207.1737.

WANG Rui-rong, WANG Wei,. X-ray line profile measurements in laser produced plasma[J]. Editorial Office of Optics and Precision Engineering, 2014,22(7): 1737-1742 DOI： 10.3788/OPE.20142207.1737.

摘要

开展了利用X射线特征谱轮廓诊断激光等离子体状态参数的研究。在“神光II”激光装置上，将 0.35 μm频谱激光束聚焦于真空室内固体氯（Cl）元素靶上产生激光氯等离子体，利用高分辨X射线椭圆弯晶谱仪获取高能谱分辨激光氯等离子体辐射的X射线精细结构能谱。用类氢（1s-3p）和类氦（1s

-1s3p）氯离子能级跃迁光谱线的光强度比率计算了激光等离子体的电子温度；然后在假定光性为薄的情况下，利用X射线谱线Lyman-线形轮廓的Stark效应所产生的谱线展宽测量了等离子体的电子密度。实验获得的激光等离子体日冕区内体平均电子温度约为450 eV，电子密度约为7.5×10

-3

。文中还简单分析了能谱线的半高全宽度（FWHM）值以及诊断过程引入的诊断误差，初步预估诊断误差可控制在25%以内。该项工作为X射线特征谱轮廓法进一步应用于激光聚变靶丸压缩度精度测量等工作提供了参考。

Abstract

This paper explores the parameter measurement in laser produced plasma by X-ray line profile spectrscopy.The experiment was conducted on the SG-II laser facility.A 0.35 μm laser beam was focused on a solid chlorine (Cl) target in a vacuum chamber to produce a laser chlorine plasma and the high resolution X-ray elliptical bent crystal spectrograph was used to obtain the X-ray fine structure energy spectrum of the chlorine plasma radiation.The line integrated intensity ratio between H-like Cl (1s-3p) (Lyman-) and He-like Cl (1s

-1s3p) (He

) transitions was used for calculation of the electron temperature.By assuming optically thin

the Lyman-stark broadened profile was utilized to measure the electron density.Obtained experimental results show that the volume averaged electron temperature of Te is about 450 eV and the electron density of Ne is approximately 7.5×10

-3

.In addition

the line Full Width at Half Maximum (FWHM) was analyzed.The uncertainty in Ne due to uncertainties in the temperature and the assumed background level was also simply discussed and it is estimated to be within 25%.As a result

the experimental spectroscopic method may become a reference for diagnosing future higher-compression implosions.

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